Piano-lock.



A. WILBERG.

PIANO LOCK.

APPLICATION FILED MAY s. 1913.

Patented Feb. 24, 1914.

COLUMBIA PLANOGRAPH C0.. WASHINGTON. D. e.

ALBIN WILBERG, OF DE KALB, ILLNOIS.

PIANO-LOCK.

Specieaton of Letters Patent.

Patented F eb 221i-, it? it.,

Application led May 3, 1913. Serial No. 785,297.

To @ZZ whom 'it may concern.'

Be it known that l, ALBIN VVILBERG, a citizen of the 'United States, residing at De Kalb, in the county of Dekalb and State ot illinois, have invented new and useful lmprovements in Piano-Locks, oi" which the following is a speciiication.

lilhis invention relates to that class of locks which are designed for use upon pianos and organs and which embody a vertically and laterally movable bolt, a key actuated cam for operating the bolt and a spring tor retaining` the cam in its adjusted positions, the object of the invention being to provide simple and etlective guiding and controlling means between the bolt and lock casing by which the end et the bolt will be positively disposed and maintained in alinement with the tace plate of the casing, a positive locking and unlocking action secured, when the bolt is projected and retracted, and the necessity of trimming the parts of the lock avoided to secure proper motion and arrangement of the bolt.

rlfhe invention consists of the features ot construction, combination and arrangement oi parts hereinafter fully described and claimed, reference being had to the accompanying drawings, in which :d

Figures l, 2 and 3 are vertical sections through. a lock casing showing the bolt in ditlerent positions. Fig. l is a detail section on line d-d of Fig. 2.

Referring to Figs. l to 4l, inclusive, ot the drawings, l designates a lock casing having a face plate 2 provided with a slot or opening 3 through which moves the keeper engaging portieri of the bolt l. The body 5 of the bolt is provided7 as usual, with a recess to receive the actuating arm 6 ot the cam 7, which is journaled upon the casing and provided with the keyhole 8. rlhe recess in the body 5 is so shaped as to provide portions adapted to be engaged by the arm 6 to litt the bolt and move it laterally in one direction of movement of the cam, and to depress the bolt and return it to normal position, in the opposite direction ot movement ot' the cam. rEhe cam is provided with the usual retaining lug or projection l0 adapted for engagement with a spring 1l, whereby the cam is maintained in its positions ot' adjustment.

Ordinarily, in locks of this character, the cam is relied upon to maintain the retracted bolt in proper position with its outer end flush with the face plate, but when the parts are carelessly made or are not accurately fitted together, or wear occurs, the bolt is liable to be out of proper position or to have an improper range et motion, thus rendering it necessary to trim or relit the parts in order to make the bolt positive and eltective in its locking and releasing actions. In order to overcome these objections, l provide eitherA the front Tall or the back wall of the casing with a guide slot 12 inclined at an oblique angle to the vertical path of the bolt, and which receives a tongue or projection i3 formed upon the lower cam engaging arm of the bolt, whereby the bolt is guided in its vertical movements and at the same time is permitted to move laterally and is properly guided in its lateral movements. The upper and lower end walls ifiand 15 of this slot serve as stops for coaetion with the tongue or projection 13, whereby the movement oit' the bolt is positively arrested when the bolt is fully projected or retracted. llie stop surface l5 further limits the inward movement oi the bolt at the time when the outer end ot the bolt lies Hush with the tace plate 2, thus obviating the necessity of trimming the parts to secure a proper arangement and movement of the bolt, and at the same time providing tor a positive and eertain locking and releasing action ot the bolt without the necessity ot' making other and complex provisions therefor.

l claim A piano lock comprising a casing having a tace plate provided with a bolt slot, said casing also having one ot its walls provided with a guide slot inclined at an oblique angle to the vertical plane ot the bolt slot, a bolt movable vertically and laterally through said bolt slot, said bolt having` a biturcated body portion formingv a cam surface and projecting and retracting` arms, a key actuated cam for cooperation with said cam surface and arms to project and retract the bolt, In testimony whereof I affix my signa-ture and a tongue or projection upon the retraet- 1n presence of two Witnesses.

ino` arm of the bolt movable in said inclined bolt slot, whereby the bolt is guided posi- ALBIN WILBERG' tively in its vertical and lateral movements TWitnesses:

and held when retracted With its locking OSCAR W. JOHNSONl` end flush With the face plate. JOEL DRAGELIN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, ID. C. 

